J4C, BVO, KBS. Where else I dunno also. But for my E90, I don feel alot of difference, Gruppe M much better. I mean in terms of sound. haha but powerwise I dunno also. I was wondering maybe my butt to big and fat cant really feel much difference. But Im thinking of going for a dyno though. WOnder how much HP and Torque after these mods. Hmmmm
__________________
Life is Precious, Treasure what you have, make full use of your time to achieve what you want. Stay Happy and Positive!